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Influence of PCC Filler on Wet-Web Resistance and Handsheet Properties in Papermaking

This paper discusses the impact of PCC filler on the wet-web resistance and properties of handsheets in papermaking, including the effects of CNF, starch, ASA, and C-PAM. The results show that the addition of CNF improves wet-web tensile resistance, leading to higher machine speeds and fewer breaks.

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Influence of PCC Filler on Wet-Web Resistance and Handsheet Properties in Papermaking

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  1. CNF in papermaking: influence on the wet-web resistance and handsheets properties using PCC as filler Tiago F. Nunes, Ana F. Lourenço, José A. F. Gamelas, Paulo J. Ferreira 26th and 27th May 2015 San Sebastian, Spain

  2. CNF productionandcharacterization 2 COST ACTION FP1105 San Sebastian 26TH and 27TH May 2015 Mechanicaltreatment (homogenizer) • - E. globuluskraft pulp [1% (w/w)] • TEMPO (0,016 g/g) • NaClO (5 and 11 mmol/g of pulp) • NaBr (0,1 g/g) • NaOH (for pH control) Chemical treatment • Yield (gravimetric analysis) • Concentration of carboxylic groups (conductometric titration) Characterization Final product

  3. Lab handsheets productionandcharacterization 3 COST ACTION FP1105 San Sebastian 26TH and 27TH May 2015 - Refined E. globuluskraft pulp (36ºSR) - CNF (3%, w/w) - PCC (20% and 30%, w/w) - Starch (1%, w/w) - ASA (0,12%, w/w) - C-PAM (0,02%, w/w) mix during 5 minutes Handsheets formation • Drainage time • Basis weight • Filler retention • Tensile strength • Air resistance (Gurley) • Wet-web resistance • Porosity of handsheets Characterization

  4. Handsheets Porosity • The total porosity of both handsheets (with CNF 5 and CNF 11) is practically the same, which in principle is contrary to the results of the air resistance • However, the handsheets produced with the smaller CNF (11 mmol/g) have much more larger pores, contributing therefore to the more reduced air resistance 4 COST ACTION FP1105 San Sebastian 26TH and 27TH May 2015 CNF 11 CNF 5 Total porosity: 58,57 % Total porosity: 57,03 %

  5. Bondingmechanism • CNF acts as flocculantofthe PCC particlesbythepatchingmechanism • C-PAM acts as retentionagentofthe PCC agglomerates 5 COST ACTION FP1105 San Sebastian 26TH and 27TH May 2015

  6. Wet-web resistance • The addition of CNF 5 increases the tensile index for moisture values below 60% • In terms of the paper machine runnability, for moisture contents common in the drying section, the use of CNF may contribute, through the higher wet-web tensile resistance, to less breaks and to higher operating machine speeds 6 COST ACTION FP1105 San Sebastian 26TH and 27TH May 2015

  7. Thankyou for yourattention! The authors acknowledge QREN (Quadro de Referência Estratégico Nacional) for financial support (QREN 34169 NMC) and RAIZ (Instituto de Investigação da Floresta e do Papel) for the laboratory facilities and some furnish components. 7 COST ACTION FP1105 San Sebastian 26TH and 27TH May 2015

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